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2145 Blaauw (1976 UF)
Classification: Outer Main-belt Asteroid          SPK-ID: 2002145
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0999553516474217 4.4697e-08  
a 3.216874743652712 2.0354e-08 au
q 2.895330897445195 1.4045e-07 au
i 15.01456138627091 3.8551e-06 deg
node 264.2963075759108 1.9082e-05 deg
peri 278.5070026596896 2.8839e-05 deg
M 125.218491472051 2.342e-05 deg
tp 2458267.480344684187
(2018-May-28.98034468)
0.00013524 TDB
period 2107.412993172761
5.77
2.0001e-05
5.476e-08
d
yr
n .1708255577650261 1.6213e-09 deg/d
Q 3.538418589860228 2.2388e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2548  
   data-arc span      16094 days (44.06 yr)  
   first obs. used      1976-10-24  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3621  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:04:34  

Additional Information
 Earth MOID = 1.94539 au 
 Jupiter MOID = 1.7251 au 
 T_jup = 3.129 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457300.5 (2015-Oct-05.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09625550886979237 4.4814e-08  
q 2.908682966278911 1.3964e-07 au
tp 2458267.349778327174
(2018-May-28.84977833)
0.00013898 TDB
node 264.3509959943059 1.9082e-05 deg
peri 278.6848299635125 2.9252e-05 deg
i 15.00812063552195 3.8459e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2548  
   data-arc span      16094 days (44.06 yr)  
   first obs. used      1976-10-24  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3621  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:04:34  

Additional Information
 Jupiter MOID = 1.7251 au 
 T_jup = 3.129 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.008322080514519E-15 -6.209143804922097E-15 -1.975324094888963E-12 -5.71811145467977E-16 -3.599248439412162E-13 3.984853002962709E-15
q -6.209143804922097E-15 1.949909130939403E-14 6.879443243341478E-12 3.541514576166963E-16 1.213194412167081E-12 -1.101686216452035E-14
tp -1.975324094888963E-12 6.879443243341478E-12 1.931464496631047E-8 -1.054022968816146E-12 3.123073317148177E-9 -4.733383767420678E-12
node -5.71811145467977E-16 3.541514576166963E-16 -1.054022968816146E-12 3.641174838350869E-10 -3.516491372969561E-10 2.646708901990125E-11
peri -3.599248439412162E-13 1.213194412167081E-12 3.123073317148177E-9 -3.516491372969561E-10 8.556868770555683E-10 -2.647559239019596E-11
i 3.984853002962709E-15 -1.101686216452035E-14 -4.733383767420678E-12 2.646708901990125E-11 -2.647559239019596E-11 1.479127947381676E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.0   n/a MPO452191  
diameter diameter 40.549 km 0.848 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 12.141 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Moravec, P.; Cochren, J.; Gerhardt, M.; Harris, A.; et al. (2012) Minor Planet Bull. 39, 213-216.]
geometric albedo albedo 0.051   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2145 Blaauw (1976 UF)          Discovered 1976-Oct-24 by West, R. M. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1976 UF = 1929 XS = 1963 RK = 1980 TW 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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